Identification of vibration sources in optical disk drives using transfer path analysis

Young Bae Chang, Kyoung Hoon Ham, No Cheol Park, Young Pil Park

Research output: Contribution to journalConference articlepeer-review


In complicated structures it is difficult to determine causes of vibration because of non-linearity and variation of the system. Though Operating vibration signal has a strong similarity to dynamic characteristics of the structure in static state, it is too early to conclude that resonance of the structure brings out vibration of the structure without source identification. In vibration source identification it is important to decide not only the location and the number of sources but also rankings of sources. With this information one can know vibration generation mechanisms and devise counter plans. This research demonstrates the application for vibration source identification in optical disk drives. There are many vibration sources such as the external disturbance, the disk vibration, airflow, the motor vibration, and the chassis vibration in optical disk drives. These vibration sources are inputs of the system. And focus error signal is an output of the system. Therefore optical disk drive can be defined as a MISO system. In this research, the multiple coherence function between the output and all inputs is evaluated experimentally. The partial coherence functions are used to show which source is the major sources of focus error signal.

Original languageEnglish
Pages (from-to)324-327
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventSixth International Symposium on Optical Storage (ISOS 2002) - Wuhan, China
Duration: 2002 Sept 222002 Sept 25

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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